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Hi, On Fri, Sep 12, 2014 at 7:32 AM, Jason Stirnaman <[log in to unmask]> wrote: > Thanks, Steve! Thought I had tried that, but it's exactly what I was looking for. One caveat though -- at least in MARC21, re-sorting a MARC record strictly by tag number can be incorrect for certain fields. For example, 6XX fields are meant to be ordered by the significance that the cataloger assigns to each subject heading. Here's a contrived example -- a book that is about textual criticism in general but which contains extensive examples about Biblical and Shakespearan textual criticism: 650 $a Criticism, Textual 630 $a Bible $x Criticism, Textual. 600 $a Shakespeare, William, $d 1564-1616 $x Criticism, Textual Sorting the 6XX in numerical order would be incorrect, strictly speaking. Similarly, notes fields (5XX) can be entered in AACR2 order, which doesn't necessarily correspond to numeric tag order. I can't speak to the specifics, not being well-versed in Ruby, but assuming that the underlying sort is stable, you might want to use a custom comparator that leaves the relative 5XX and 6XX field order alone. Regards, Galen -- Galen Charlton Manager of Implementation Equinox Software, Inc. / The Open Source Experts email: [log in to unmask] direct: +1 770-709-5581 cell: +1 404-984-4366 skype: gmcharlt web: http://www.esilibrary.com/ Supporting Koha and Evergreen: http://koha-community.org & http://evergreen-ils.org